CN100469045C - Method for setting the retransmission timeout period in a packet switched communication network - Google Patents
Method for setting the retransmission timeout period in a packet switched communication network Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/188—Time-out mechanisms
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- H04L47/10—Flow control; Congestion control
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- H04L47/28—Flow control; Congestion control in relation to timing considerations
- H04L47/283—Flow control; Congestion control in relation to timing considerations in response to processing delays, e.g. caused by jitter or round trip time [RTT]
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- H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
- H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures
Abstract
The present invention relates to a method for updating the value of a time-out period in a data unit sender. The updating comprises deriving an intermediate value from the n most recently measured values of a response time, augmenting the intermediate value, reducing the current value of the time-out period, determining the maximum from among at least the augmented intermediate value and the reduced current value of the time-out period, and setting a new value of the time-out period to set a maximum value.
Description
Invention field
The present invention relates to a kind of method of the value that is used for upgrading the data unit sender time out period and be arranged to carry out the data unit sender of the method.
Background of invention
Usually, difference circuit switching connection and data cell switched communication in the communications field.In the data cell exchange connects, many data to be sent are divided into data cell, then the agreement according to control communication sends these data cells.Can notice that data cell obtains different titles, for example grouping, frame, section etc. in the context of different agreement.In this application, general using term " data cell " any this segmentation of data of touching upon.
For guaranteeing the reliable transmission of data, many agreements provide the feature of data unit retransmission.More particularly, the data unit retransmission meaning is that the data cell receiver is carried out feedback mechanism, according to its receiver feedback message is sent to data unit sender, wherein each feedback message comprises the information about the reception of the data cell that sent by data unit sender.Information type in the feedback message can be all kinds, for example, can confirm the correct reception of data cell and/or the mistake in the indication received data unit.The example of this feedback message is affirmation message or the ACK that learns from TCP or other agreements.Data unit sender relies on the information in the feedback message, by retransmitting one or more data cells that send these feedback messages is reacted.
Feature general and that retransmission mechanism provides together is so-called retransmission time out.The time out feature meaning is, if data unit sender does not receive the feedback message of the correct reception of the given data cell of indication in given time out period, data unit sender is retransmitted the described given data of giving.If this feature guarantees data unit loss, the data cell of losing so with the time out period of being carried in the above after re-transmission automatically.
It is so-called transmission control protocol (TCP) that example with the agreement of the retransmission mechanism of time out feature is provided, and it is the part of famous ICP/IP protocol group.
In the communication between given transmitter and given receiver, obviously time out period should depend on the response time in a certain mode.Response time is illustrated in the transmission data cell and receives about elapsed time between the feedback message of this data cell.In TCP and some other agreements, this response is also referred to as Loop Round Trip Time (RTT).
If receiver is " far " (i.e. Chang response time), time out period should be provided with longlyer so than the receiver (i.e. Duan response time) of " closely ".Be understandable that equally, should time out period be set to necessary must grow and as far as possible short.That is, if time out period is too short, data unit sender will can not waited for the sufficiently long time for the reception of feedback message so, and therefore optionally retransmit given data cell.This non-essential re-transmission is also referred to as pseudo-the re-transmission.In other words, pseudo-retransmit the meaning be if transmitter waited for long a little a bit, thereby it will receive feedback message and not retransmit this data cell.On the other hand, oversize if time out period is provided with, this causes non-essential delay in the transmission so, because the re-transmission of lost data units can enough fast generation.
Be used on the response time based measurement, suitably calculating the method in retransmission time out cycle and come into question the quite a while, for example in originating in 1983 RfC 889.About TCP, the method for the renewal retransmission time out cycle RTO that uses defines in RfC 2988 at present.According to this RfC, the renewal of the RTO on the basis of the measured value of response time or Loop Round Trip Time RTT is:
Δ＝RTT-SRTT
SRTT←SRTT+1/8·Δ
RTTVAR←RTTVAR+3/4·(|Δ|)-RTTVRR)
RTO＝max(SRTT+4·RTTVAR，1?sec)。
SRTT represents the level and smooth average of Loop Round Trip Time RTT, and RTTVAR represents the indication of the variance of RTT.As a result, the notion of RfC 2988 is the retransmission time out cycle upgraded or is adjusted into the weighted sum of variance of the level and smooth average and response time of response time, wherein keeps minimum value 1 second.
The notion of definition has many defectives in RfC 2988.Be understandable that the value in retransmission time out cycle should be followed the measured value of response time.In other words, if RTT increases, RTO should increase so, and if RTT descends, RTO should descend so.Yet for the method for above-mentioned renewal RTO, this is always not true.If unexpected RTT drop takes place, in calculating RTTVAR, use the fact of the absolute value of Δ to cause RTTVAR to increase so, it then also finally causes RTO to increase suddenly.So although RTT descends, RTO has increased, this causes the unnecessary delay in the transmission of data cell.
Another problem in the notion of above-mentioned RfC 2988 is so-called " magic number " 1/8 and 1/4 as the weight coefficient use.These coefficients are only carried out the situation of a measure R TT (promptly once only measuring a RTT) through selecting and be optimised to each RTT cycle.Yet, when being that data cell that each sent is when making RTT and measuring for example by utilizing timestamp, when the quantity of uncompleted data cell is big, if or between continuous RTT sample, do not have great change, these coefficients can not get satisfied result in upgrading RTO.When band-limited link for example keeps the queue row before Radio Link or the modem link, this situation can take place.
Notice that term " uncompleted data cell " refers to be sent out but still do not receive feedback case as there not being the data cell of acknowledge message.
In these cases, the equation that is proposed by RfC 2988 draws the situation that SRTT converges on RTT, and △ converges to zero, thereby RTTVAR also converges to zero.As a result, the value of RTO converges to RTT.This does not expect, because RTT can be regarded as the bare minimum of RTO, receives feedback message since can not be expected at than RTT in the shorter time.As a result, above-mentioned RTO " slump " becomes the phenomenon of RTT to cause improving greatly the pseudo-probability that retransmits.
WO 01/13587 A2 proposes to improve the method for upgrading RTO.These methods for example are to make the calculating of RTTVAR to depend on the threshold condition of RTT, be to make weight coefficient to be adaptive and to make the renewal of RTO depend on the pseudo-quantity that retransmits in addition.
Goal of the invention
New and the improved method that the purpose of this invention is to provide the value of time out period in the data unit sender that a kind of renewal comprises the retransmission time out feature.
Brief summary of the invention
The invention provides a kind of method of value that is arranged data cell is sent to the data unit sender time out period (RTO) of given data cell receiver that is used for upgrading, described given data cell receiver is carried out a kind of feedback mechanism, according to its described given data cell receiver feedback message is sent to described data unit sender, described feedback message comprises the information about the reception of the data cell that is sent by described data unit sender, described data unit sender is carried out retransmission mechanism, rely on described feedback message retransmission of data units according to its described data unit sender, described retransmission mechanism comprises time out feature, if in described time out period, do not receive according to its described data unit sender the given data cell of indication correct reception feedback message described data unit sender retransmit described given data cell, and described data unit sender is carried out the definite mechanism of response time that is used to repeat to determine the response time (RTT) in addition, response time (RTT) indication is elapsed time between data cell being sent to described given data cell receiver and receiving about the feedback message of described data cell from described given data cell receiver, and described method comprises:
Be used to be provided with the value setting up procedure of the new value of described time out period, described process is considered n of described response time value recently, and n is a positive integer, comprising:
-according to predetermined derivation Der described n (S1) median IV of value derivation recently from the described response time,
-increase (S2) described median according to predetermined increase process Aug,
-reduce the currency that process Red reduces (S3) described time out period according to predetermined time out period,
-from the currency of the described reduction of the median of described at least increase and described time out period, determine maximum, and
The new value of-described time out period is set to described maximum.
The present invention also provides a kind of data unit sender (3) that is used for data cell is sent to the data cell receiver of one or more execution feedback mechanisms, according to the described data cell receiver of feedback mechanism feedback message is sent to described data unit sender, described feedback message comprises that described data unit sender comprises about the information of the reception of the data cell that is sent by described data unit sender:
Retransmission element (331), be used to carry out retransmission mechanism, rely on described feedback message retransmission of data units according to its described data unit sender, described retransmission mechanism comprises time out feature, if in the described time cycle, do not receive according to its described data unit sender the given data cell of indication correct reception feedback message described data unit sender retransmit described given data cell
Response time is determined element (332), be used for carrying out the definite mechanism of response time that is used to repeat to determine the response time (RTT), response time (RTT) indication is elapsed time between data cell being sent to given data cell receiver and receiving about the feedback message of described data cell from described given data cell receiver
Value setting element (333) is used to be provided with the individual new value of the described time out period of value recently of the n that considers the described response time, and n is a positive integer, comprises
-be used for from the element of described n the nearest value derivation median of described response time,
-be used for increasing the element of described median according to predetermined increase process,
-be used for reducing the element of the currency of described time out period according to predetermined time out period reduction process,
-be used for determining peaked element from the currency of the described reduction of the median of described at least increase and described time out period, and
The new value of-described time out period is set to described peaked element.
According to the present invention, time out period is to be upgraded by the process of the n that considers the response time nearest value, and wherein n is a positive integer.Renewal process comprises the process of the new value that is used to be provided with time out period, comprises according to predetermined derivation from n of response time value derivation median recently.Median has the purposes to the indication that appears at the response time.Equally, median can be for example recently the n of response time (n=1), response time recently the selection operation of value result, the n of response time recently value upward the generation of the result of average operation or any other type to the function of the value of the indication that appears at the response time or the result of selection operation.
According to renewal process of the present invention, median increases according to predetermined increase process, and the currency of time out period reduces according to time out period reduction process.Then, be set to the new value of time out period from the maximum in the currency of the reduction of median that increases at least and time out period.
As seen, notion of the present invention is to depart from the notion that is proposed by RfC 2988 fully.Be not must the calculated response time level and smooth average (this is possible although when determining median), and especially no longer consider the variance of calculated response time. on the contrary, notion of the present invention is the sizable simplification about RfC 2988 notions.The present invention is provided for upgrading the mechanism of time out period thus, and it has showed good performance in experiment, and it can solve the problem of the process that is proposed discussed above in RfC2988.
More particularly, owing to be used to increase the process of median, wherein median is given the indication appear at the response time, thus the value that guarantees time out period not " slump " become the value of response time because the increase process provides the distance of qualification between median and time out period value.On the other hand, guarantee that median descends (its indication response time is descending) if be used to reduce the reduction process of the currency of time out period, the new value of time out period also will descend so.The degree of this decline or decay is regulated by the reduction process of selecting.
Brief description of drawings
To at once the present invention be described in more detail, wherein about with reference to the accompanying drawings some the 3rd embodiment
Fig. 1 illustrates the basic flow sheet of the embodiment of the invention,
Fig. 2 is at network communication and can be used as data unit sender and carry out schematically showing of many communication equipments of the present invention,
Fig. 3 is according to the schematically showing of the data unit sender of the embodiment of the invention, and
Fig. 4 illustrates the figure of the characteristic of response time and time out period in embodiments of the present invention.
Describe in detail
In the description of following example, will be with reference to term and the expression learnt from transmission control protocol (TCP), for example the Loop Round Trip Time of the retransmission time out cycle of response time or RTO and indication elapsed time in the transmission of data cell and between about the reception of the feedback message of described data cell or these terms of RTT. and abbreviation are for convenience and simple and use, understand them because those skilled in the art are non-, rather than be intended to the application of notion of the present invention is confined to TCP or any other specific communication protocol.Equally, general use is done in above mentioned expression and abbreviation.That is, the notion that the present invention is used to upgrade time out period can be used for any agreement that the retransmission time out feature is provided, for example SCTP (SCTP).
Fig. 1 illustrates the flow chart of the basic embodiment of the present invention.At step S1, according to n the recently value derivation median IV of predetermined derivation from RTT.At step S2, median increases according to predetermined increase process, and at step S3, the present value of RTO is according to predetermined RTO reduction process reduction. and at step S4, select the maximum of the RTO of IV and reduction, and in step S5, be made as the new value RTOnew of RTO.
This can also be expressed as pseudo-code with the form of compactness:
RTO＝max(Aug(Der(RTT
i))，Red(RTO)) (1)
Red represents the reduction process, for example is used to calculate the function or the routine of the reduction value of RTO, like this Red (RTO)＜RTO.Der (RTT
i) expression is used for from the n of RTT the routine of value derivation median, IV=Der (RTT so recently
i), i=1 wherein ..., n.Aug (IV) represents the increase process, for example is used to increase the function or the routine of IV value, like this Aug (IV)〉IV.Max represents to select the operation of maximum from the item that these are pointed out.
Can notice that total renewal of time out period RTO can relate to other process, and can relate to more more than item Aug and Red.That is, can expect, in maximum choice function max, consider other control coefrficient, and the new value of RTO determine that at last it also is possible relating to other step, for example
RTO＝max(RTO，max(RTT_prev，RTT)+2·tick) (2)，
In equation (2), RTT represents the currency of response time RTT, and what RTT_prev represented RTT is right after the previous value in ground, and tick represents the basic granularity of basic timer, i.e. increment, and system timer is according to these increments countings rise time.Equation (2) is carried out afterwards at equation (1), that is, be the value of calculating on the left-hand side in equation (1) at the value RTO that points out on the right-hand side of equation (2).
Above-mentioned basic skills can be used as data unit sender and use in any equipment of retransmission time out feature and embody. and Fig. 2 is illustrated in schematically showing of the communication equipment arranged in the network 10, wherein equipment 21,22,23,24 is called terminal, and equipment 25,26,26,27,28,29 is called the equipment that can be used as the server of router or other types in the network.Thereby each among these equipment 21-29 can be used as data unit sender and realize notion of the present invention.
Fig. 3 illustrates schematically showing of the communication equipment that can be used as data unit sender and realize notion of the present invention.Data unit sender 3 comprises the buffer 31 that is used to preserve data, for example be arranged to send the transmission/receiving unit 32 of data cell and receiving data units on the network 10 shown in figure 2 and can carry out the transmission that is used for the control data unit and the processor 33 of the program of reception.The data cell that 38 expressions are sent by transmitter 3, and 39 expressions are from the feedback message of the receiver (not shown) reception of communication.
The processor 33 that illustrates has the retransmission element 331 that realizes retransmission mechanism, relies on the feedback message retransmission of data units according to this retransmission mechanism data unit sender 3.332 expressions are used to realize to repeat to determine that the response time of response time value determines that the machine-processed response time determines element.At last, 333 expressions are arranged to implement to be used to be provided with the value setting element of value setting up procedure of the new value of time out period.In the example of Fig. 3, element 331-333 is the software element of being carried out by processor 33.Software element is the part of computer program, computer program or the routine that can carry out respective process.Like this, value setting element 333 comprises that the sub-element of median that is used to derive, the sub-element that is used to implement the process that increases, the sub-element that is used to implement time out period reduction process, the new value that is used to select the sub-element of maximum and be used for time out period are set to peaked sub-element.
Although first-selected is is used to implement said process and the element of the process that will be described below is a software element, in any desired way promptly by software, to provide these elements by hardware or the combination by any suitable hardware and software be possible basically.Owing to provide the possibility of method of the present invention, can embody the present invention with the form of the computer program that comprises the computer program that can carry out the method when the execution on data unit sender with the form of software.This computer program can be a data medium for example, and procedure stores is on this data medium.
Be used for the n of RTT recently on the basis of value the purpose of the derivation step of acquisition median provide value to the indication that appears at RTT.Under the simplest situation, this can be the nearest value of RTT, n=1 in this situation.As selection, the influence of singular effects in measuring for fear of RTT, it also is possible using two nearest values of response time, and for example median IV is set to this mean value of two, perhaps selects the maximum that these two nearest RTT measure.
Usually, when considering that n RTT measures recently, on average be possible with these values in order to generate median, it is possible perhaps carrying out selection operation according to predetermined selection criteria on the individual RTT value recently of described n, and then selected value is set to median.Preferably, choice criteria is a maximum, and n from RTT selects maximum the value recently like this.
In order to keep the simplicity of solution of the present invention, expectation is not selected n too big.Equally, value n=2 provides huge simplicity, but avoided simultaneously the singular effects of RTT in measuring (as the RTT of a sample unexpected with of short duration drop) influence the RTO renewal process negatively.
In order to reduce RTO, reduction process Red (RTO) can be arranged in any mode suitable or expectation, for example by deduct constant decrement value from RTO.Preferably, reduction process Red (RTO) comprises reduction RTO value to predetermined decay fraction, and described decay fraction is distributed in 0 to 1 the scope.Tapering to predetermined mark can for example be undertaken by the suitable coefficient of the value of multiply by in 0 to 1 scope.
Basically, can select decay fraction in any mode suitable or expectation, and can for example be constant.How positive or conservative this constant can be regulated according to the preference of reduction RTO value that will be.That is, the big value meaning of mark is that reduction is little (conservative), otherwise the little value meaning of mark is reduction significantly (positive).Example is a value 0.75.
Selectivity constant on the basis of other Control Parameter that control sends data cell can also participated in.For example, decay fraction can depend in the quantity of measuring with the response time that each response time is done at interval during given receiver is communicated by letter.If data unit sender is arranged in this mode of once only implementing a RTT measurement, be that data unit sender is beginning to wait for finishing of RTT measurement before RTT measures next time, this quantity of each response time response time measurement at interval is 1 so.On the other hand, if for example utilize the data cell measure R TT of timestamp option for each transmission, the quantity that each RTT carried out so RTT measures equals the quantity (quantity that also claims the data cell of " awing " sometimes) of uncompleted data cell, and wherein uncompleted data cell is to be sent out but its feedback message does not also have received such data cell.
The quantity that decay fraction is measured the RTT of each RTT relevant preferably like this, if this quantity is big, then mark such as fruit quantity hour more near 1.Reaching this relevant a kind of mode is for example to be calculated as follows mark:
X is a multiplication coefficient in equation (3), can be constant or adaptive parameter (this will explain hereinafter in more detail), and SamplesPerRTT represents the quantity that the RTT of each RTT measures.
On the basis of equation (3), reduction process Red (RTO) can for example be arranged to
Red(RTO)＝FRAC·RTO (4)
Point out that as top decay fraction can be a constant, can depend on other parameter again.Yet decay fraction self also can be adaptive.In this case, provide the decay fraction renewal process, the quantity of the pseudo-data cell that retransmits was operated during it preferably relied on and communicates by letter with given data cell receiver.As previously mentioned, if for example along the communication between transmitter and the receiver too much delay is arranged, then pseudo-the re-transmission taken place, and causes that so in fact overtime data cell do not lose, and if RTO longer, overtimely can not take place.
Renewal process is preferably arranged by this way, if the pseudo-quantity that retransmits increases, then its increases decay fraction (making it more near 1), and if the pseudo-quantity that retransmits descend then reduce decay fraction (making it) more near 0.
More preferably, the renewal process of decay fraction is included in the ratio of the sum of the data cell that preset time in the communication between transmitter and the receiver monitors the quantity of the pseudo-data cell that retransmits in the scope and sent. in other words, renewal process preferably depends on the pseudo-relative populations that retransmits. upgrades operation and can comprise then and provide first or low threshold value and second or high threshold, the described first threshold height of described second threshold ratio, if and measured ratio is positioned at low threshold value with next reduction decay fraction (promptly, thereby make it more near 0 and make the reduction among the RTO more positive), if perhaps measured ratio surpasses high threshold then makes decay fraction bigger (promptly, make it more near 1, thereby make the reduction among the RTO more conservative).
The pseudo-detection that retransmits can be finished in any mode suitable or expectation, and for example described in EP-A-1 018 821 or WO 01/13587 A2, they all are combined in this by reference.
Basically, by because to determine the feedback message that is received after the given data cell of overtime re-transmission be not the data cell that retransmits of response but response causes overtime data cell discerns pseudo-overtime.
Determine that pseudo-overtime a kind of method can be the record that makes between transmitter maintenance and transmitter and the receiver the related RTT of (more particularly send peer and receive between the peer) communication, and especially make transmitter remain on the time point of record in consideration of the shortest RTT that finds in communication (perhaps session) process.So if the feedback message of retransmission of data units receives in the littler time out period of the percentage more predetermined than the shortest RTT, then transmitter determines that this feedback belongs to original transmitted rather than re-transmission.The value that this percentage can be set to fix or it self can be adaptive parameters.Naturally, the comparison value that multiply by described percentage is that the shortest RTT that measures is unnecessary, but the SRTT value that transmitter keeps average RTT value for example to discuss in introduction also is possible, and this mean value is as determining the pseudo-basis that retransmits.On this meaning, multiply by the function of the normally one or more RTT values of in communication process, measuring of comparison value of percentage.
Determine that pseudo-another possibility that retransmits is to make transmitter add the data cell that mark sends to it, wherein said mark allows this mode of difference original transmitted and re-transmission to define with it.Then, receiver can the respective markers feedback message, thereby transmitter can be discerned feedback message and refers to original transmitted and still retransmit.This mark of data cell can be finished in any desired way.For example, it is possible only specifying single-bit in the data cell that sends, and one of them bit value is pointed out original transmitted and another bit value is pointed out to retransmit.Another kind of possible mark is the bit stream that can transmit more information.Also have a kind of possibility to be to use so-called timestamp option, it for example is because TCP and well-known.In other words, comprise that in the data cell that is sent timestamp is possible, it points out when sent data cell.So receiver can only comprise identical timestamp in feedback message, thereby transmitter has the mode of the data cell of unique identification feedback message indication.
The renewal of above-mentioned decay fraction can be for example to reach by correspondingly being updated in the x value shown in the equation (3).More particularly, based on ratio and low threshold value and the high threshold of the above-mentioned pseudo-data cell that retransmits with the data cell that is sent, x can increase if ratio surpasses high threshold, can reduce than the littler then x of low threshold value if ratio becomes.
Low and high threshold can be selected in any mode suitable or expectation, and wherein high threshold can be for example 1% and low threshold value is 0.5%.The suitable initial value of x can be in 2 to 20 scope.Make the greater or lesser operation of x realize preferably having identical value by utilizing suitable predetermined increment or decrement.
Be similar to derivation and time out period reduction process, can select the increase process in any mode suitable or expectation. for example, increase IV and make Aug (IV) IV can finish by increasing predetermined increment to IV.Preferably, increase process comprises with value and multiply by median greater than 1 predetermined increase coefficient.In other words, increase process can be performed as follows:
Aug(IV)＝y·IV；y>1 (5)
Wherein y can be a constant, perhaps can be adaptive parameter.Y is preferably located in the scope between 1 and 2, for example y=1.5.
If it is adaptable making increase coefficient y, increase coefficient update process then is provided, it preferably considers k the nearest value of RTT, k is a positive integer.K can have the value identical with n, but also can select greater or lesserly.
So increasing the coefficient update process can comprise:
The individual new value of the variation indication parameter of the variation of value recently of k of deriving and indicating RTT, increase the currency of variable according to predetermined increase variable reduction process reduction, from the increase variable of the described new value of described variation indication parameter and described reduction, determine maximum, the new value of described increase variable is set to described maximum, and the new value of described increase coefficient is set on the basis of described new increase variable.
Provide a example by establish an equation down (6-8) about this:
N_AMP＝(RTT-RTTprev)/RTTprev (6)
Booster＝max(N_AMP，Red
＊(Booster)) (7)
y＝f(Booster) (8)
N_AMP represents variation indication parameter, and it is that two nearest values of RTT are current response time RTT and are right after relative mistake between the previous response time RTTprev in ground in the example of equation (6).Yet, can notice that this only is an example, and other definition of variation indication parameter are possible.
After the new value of the definite N_AMP that in as equation (6), points out, relatively with the currency of the value of the N_AMP that so calculates and the reduction that increases variable Booster.In equation (7), the maximum of this value is set to increase the new value of variable Booster, and equation (8) expression is defined as coefficient y the function of so definite variable Booster.
Can select reduction process Red in any mode suitable or expectation
*Thereby, Red
*(Booster)＜Booster.Preferably, Red
*Identical with Red, like this
Red
＊(Booster)＝FRAC·Booster (9)
When variation indication parameter was relative mistake between two nearest values of response time, y is preferably following to be determined
y＝1+Booster (10)
According to top notion, increase the coefficient update process according to operating with the similar principle of the renewal process of RTO.That is, or variable Booster is set to equate with the instantaneous variation of RTT, if or the version of reduction big then variable Booster is set to equate with the version previous value reduction or decay of Booster than the instantaneous variation of RTT.Thereby, if RTT increases suddenly, so Booster and therefore y will follow, if instead the variation of RTT diminishes (for example many RTT measure and produce identical value), Booster and therefore y will be according to reduction process Red
*Decay.
When using these two of RTT recently during the relative mistake between the value, the problem of the initial value of this parameter N _ AMP has appearred how being provided with, and be exactly first or during initial measurement promptly when having only a RTT to measure available.Because a RTT measures and finishes on the basis of initial synchronisation, it is also referred to as SYNRTT sometimes.
When data unit sender begin with new receiver new communicate by letter the time this relative mistake that will use initial value can be set to constant, for example make that the initial value of N_AMP is for example 1.5 or 2.
Preferably, with the basis of the pseudo-initial data unit that sends during a plurality of other data cell receivers are communicated by letter on, be provided for making the initial value of relative mistake to adapt to the initial value procedure of adaptation that is used for new communication.
In other words, data unit sender (for example among the equipment 21-29) monitors the communication of all different data cell receivers that it is communicated by letter just with it shown in figure 2.Data unit sender is then measured the quantity of the puppet re-transmission that takes place on initial or first data cell that sends.Preferably, data unit sender monitors in preset time quantity of the pseudo-initial data unit that retransmits and ratio in described preset time all efficient communication quantity in the cycle in all efficient communications in the cycle, i.e. the relative populations that retransmits of puppet on the initial data unit.If then can by with measured ratio and low threshold ratio and ratio to be positioned at low threshold value littler with the next initial value that makes, and if with this ratio with than the bigger high threshold comparison ratio of low threshold value above this high threshold then make the bigger initial value procedure of adaptation of implementing of initial value.Make the greater or lesser operation of initial value can be by utilizing the identical value of suitable predetermined increment or decrement-preferably have-realize.
The communication that the benefit of the adaptive process of this initial value that is used to upgrade the relative mistake of continuous RTT between measuring will send for the data cell that smallest number is only arranged is especially significant.In this case, the initial value of the relative mistake of mistake setting will lead to errors the initial value of y will be set, and can not suitably proofread and correct it by the process of upgrading y again, because the data cell that lastest imformation is provided or upgrades chance very little.
Fig. 4 illustrates the figure about the RTO value (triangle symbol) and the RTT value (diamond symbols) of the value of system timer, and wherein RTO upgrades as follows:
RTO＝max(FRAC·RTO，y·RTT) (11)
FRAC determines according to equation (3) in equation (11), x is arranged to constant value 4, and y is arranged to constant value 1.5.Know and notice that RTO correctly follows the direction of RTT and do not collapse into RTT.
Above-mentioned detailed embodiment is used to those technical staff that more complete understanding of the invention is provided, but intention is not restriction.More properly, the scope of protection is defined by the following claims.Quotation mark in the claims just is used to make the easier reading of claim and is intended to not be restriction.
Claims (44)
1. one kind is used for upgrading the method for value that is arranged data cell is sent to the data unit sender time out period (RTO) of given data cell receiver, described given data cell receiver is carried out a kind of feedback mechanism, according to its described given data cell receiver feedback message is sent to described data unit sender, described feedback message comprises the information about the reception of the data cell that is sent by described data unit sender, described data unit sender is carried out retransmission mechanism, rely on described feedback message retransmission of data units according to its described data unit sender, described retransmission mechanism comprises time out feature, if in described time out period, do not receive according to its described data unit sender the given data cell of indication correct reception feedback message described data unit sender retransmit described given data cell, and described data unit sender is carried out the definite mechanism of response time that is used to repeat to determine the response time (RTT) in addition, response time (RTT) indication is elapsed time between data cell being sent to described given data cell receiver and receiving about the feedback message of described data cell from described given data cell receiver, and described method comprises:
Be used to be provided with the value setting up procedure of the new value of described time out period, described process is considered n of described response time value recently, and n is a positive integer, comprising:
-according to predetermined derivation Der described n (S1) median IV of value derivation recently from the described response time,
-increase (S2) described median according to predetermined increase process Aug,
-reduce the currency that process Red reduces (S3) described time out period according to predetermined time out period,
-from the currency of the described reduction of the median of described at least increase and described time out period, determine maximum, and
The new value of-described time out period is set to described maximum.
2. according to the process of claim 1 wherein that n equals 2.
3. according to the method for claim 1 or 2, wherein said derivation comprises that nearest value of described n of average described response time and average result are set to described median.
4. according to the method for claim 1 or 2, wherein said derivation comprises select the described response time described n, and in the value and the value of described selection are set to described median recently.
5. according to the method for claim 4, one in the individual value recently of the described n of wherein said described response time of selection comprises the selection maximum.
6. according to the method for claim 1 or 2, wherein said time out period reduction process comprises and tapers to predetermined decay fraction, in the scope of described decay fraction between 0 and 1.
7. according to the method for claim 6, wherein said decay fraction depends in the quantity of measuring with the response time that each response time during described given data cell receiver is communicated by letter is done at interval.
8. according to the method for claim 6, comprise that also being used for relying on communicate by letter with the described given data cell receiver quantity of the pseudo-data cell that retransmits upgrades the decay fraction renewal process of described decay fraction.
9. according to the method for claim 8, wherein said decay fraction renewal process comprises and the ratio that monitors quantity with the total quantity of the data cell that is sent of the pseudo-data cell that retransmits during described given data cell receiver is communicated by letter in the preset time scope.
10. according to the method for claim 9, wherein said decay fraction renewal process comprises
-with described ratio and low threshold ratio, and if described ratio be positioned at described low threshold value and make described decay fraction littler with next, and
-with described ratio and relatively than the bigger high threshold of described low threshold value, and if described ratio surpass described high threshold then make described decay fraction bigger.
11. according to the method for claim 6, wherein said time out period reduction process comprises the coefficient FRAC of the value of multiply by in 0 to 1 scope.
12. according to the method for claim 11, wherein said coefficient FRAC is following to be determined:
1-1/(x＊SpRT)，
Wherein x is that adaptive parameter and SpRT are the quantity of measuring with the response time that each response time during described given data cell receiver is communicated by letter is done at interval.
13. according to the method for claim 1 or 2, wherein said increase process comprises described median value of multiply by greater than 1 predetermined increase coefficient y.
14. according to the method for claim 13, wherein said predetermined increase coefficient y is a constant.
15. according to the method for claim 13, wherein said predetermined increase coefficient y repeats to upgrade according to the individual increase coefficient update process of value recently of the k that considers the described response time, k is a positive integer.
16. according to the method for claim 15, wherein said increase coefficient update process comprises:
The new value of the variation indication parameter N_AMP of the variation in described k the nearest value of-described response time of indication of deriving,
-reduce the currency that increases variable Booster according to predetermined increase variable reduction process,
-from the increase variable Booster of the described new value of described variation indication parameter and described reduction, determine maximum, and
The new value of-described increase variable Booster is set to described maximum,
-the new value of described increase coefficient y is set on the basis of described new increase variable.
17. according to the method for claim 16, wherein said increase variable reduction process is identical with described time out period reduction process.
18. according to the method for claim 16 or 17, wherein said variation indication parameter N_AMP is the relative mistake between the nearest value of two of described response time.
19. according to the method for claim 18, the described new value of wherein described increase coefficient y be set to 1 and described increase variable and.
20. method according to claim 18, wherein described data unit sender arrangement is communicated by letter with a plurality of different data cell receivers, and be provided for making the initial value of described relative mistake to adapt to the initial value procedure of adaptation that is used for new communication, according to its described data unit sender with the basis of the quantity of the pseudo-initial data unit that retransmits during described a plurality of data cell receivers are communicated by letter on make described initial value adaptation.
21. according to the method for claim 20, the ratio of the quantity of the initial data unit that the puppet on all are effectively communicated by letter in the time cycle of wherein said data unit sender monitoring preset retransmits and the quantity of interior all efficient communications of described preset time cycle.
22. according to the method for claim 21, the wherein said initial value procedure of adaptation comprises:
-with described ratio and low threshold ratio, and if described ratio be positioned at described low threshold value and make described initial value littler with next, and
-with described ratio and relatively than the bigger high threshold of described low threshold value, and if described ratio surpass described high threshold then make described initial value bigger.
23. data unit sender (3) that is used for data cell is sent to the data cell receiver of one or more execution feedback mechanisms, according to the described data cell receiver of feedback mechanism feedback message is sent to described data unit sender, described feedback message comprises that described data unit sender comprises about the information of the reception of the data cell that is sent by described data unit sender:
Retransmission element (331), be used to carry out retransmission mechanism, rely on described feedback message retransmission of data units according to its described data unit sender, described retransmission mechanism comprises time out feature, if in the described time cycle, do not receive according to its described data unit sender the given data cell of indication correct reception feedback message described data unit sender retransmit described given data cell
Response time is determined element (332), be used for carrying out the definite mechanism of response time that is used to repeat to determine the response time (RTT), response time (RTT) indication is elapsed time between data cell being sent to given data cell receiver and receiving about the feedback message of described data cell from described given data cell receiver
Value setting element (333) is used to be provided with the individual new value of the described time out period of value recently of the n that considers the described response time, and n is a positive integer, comprises
-be used for from the element of described n the nearest value derivation median of described response time,
-be used for increasing the element of described median according to predetermined increase process,
-be used for reducing the element of the currency of described time out period according to predetermined time out period reduction process,
-be used for determining peaked element from the currency of the described reduction of the median of described at least increase and described time out period, and
The new value of-described time out period is set to described peaked element.
24. according to the data unit sender of claim 23, wherein n equals 2.
25. according to the data unit sender of claim 23 or 24, the described element of the median that wherein is used to derive comprises be used for the average described response time described n, and value and average result are set to the element of described median recently.
26. according to the data unit sender of claim 23 or 24, the described element of the median that wherein is used to derive comprise be used to select the described response time described n recently the value of the described selection in the lump of value be set to the element of described median.
27., wherein be used to select the individual described element of one of value recently of described n of described response time to be arranged to select maximum according to the data unit sender of claim 26.
28. according to the data unit sender of claim 23 or 24, the described element that wherein is used to implement described time out period reduction process comprises the element that is used to taper to predetermined decay fraction, described decay fraction is arranged in 0 to 1 scope.
29. according to the data unit sender of claim 28, the quantity that the response time that the described element that wherein is used for implementing described time out period reduction process is arranged that described decay fraction is depended on to be done at interval in each response time of communicating by letter with described given data cell receiver measures.
30. according to the data unit sender of claim 28, also comprise the element that is used to implement the decay fraction renewal process, be used for upgrading described decay fraction in the quantity of the pseudo-data cell that retransmits of dependence of communicating by letter with described given data cell receiver.
31. according to the data unit sender of claim 30, the described element that wherein is used for implementing described decay fraction renewal process comprises and being used at the quantity that monitors the pseudo-data cell that retransmits in the preset time scope monitor with the ratio of the total quantity of the data cell that is sent of communicating by letter with described given data cell receiver.
32. according to the data unit sender of claim 31, the described element that wherein is used to implement the decay fraction renewal process comprises
If-be used for described ratio and low threshold ratio and described ratio be positioned at described low threshold value with the next littler element of described decay fraction that makes, and
If-be used for described ratio with surpass described high threshold than the bigger high threshold comparison of described low threshold value and described ratio then make the bigger element of described decay fraction.
33. according to the data unit sender of claim 28, the described element that wherein is used to implement described time out period reduction process comprises the element that is used to the value of multiply by coefficient in the scope between 0 and 1.
34. according to the data unit sender of claim 33, comprise the element that is used for determining described coefficient as
1-1/(x＊SpRT)，
Wherein x is that adaptive parameter and SpRT are in the quantity of measuring with the response time that each response time during described given data cell receiver is communicated by letter is done at interval.
35. according to the data unit sender of claim 23 or 24, the described element that wherein is used to implement described increase process comprises and being used for the element of described median value of multiply by greater than 1 predetermined increase coefficient.
36. according to the data unit sender of claim 35, wherein said predetermined increase coefficient is a constant.
37. according to the data unit sender of claim 35, comprise according to the k that considers the described response time recently the increase coefficient update process of value upgrade the element of described predetermined increase coefficient, k is a positive integer.
38. according to the data unit sender of claim 37, the described element that wherein is used to implement described increase coefficient update process comprises:
Described k of-described the response time of indication that is used for the deriving element of the new value of the variation indication parameter of the variation of value recently,
-be used for reducing the element of the currency that increases variable Booster according to predetermined increase variable reduction process,
-be used for from the increase variable Booster of the described new value of described variation indication parameter and described reduction determine maximum element and
-new the value that is used for described increase variable Booster is set to the element of described maximum, and
-be used on described new increase variable basis, being provided with the element of the new value of described increase coefficient y.
39. data unit sender according to claim 38, the mode that the described element that its neutralization is used to implement described time out period reduction process is arranged to implement described time out period reduction process is identical, and the described element that is used to implement described increase variable reduction process is arranged to carry out described increase variable reduction process.
40. according to the data unit sender of claim 38 or 39, wherein said variation indication parameter is the relative mistake between the nearest value of two of described response time.
41. according to the data unit sender of claim 40, comprise the described new value that is used for described increase coefficient be set to 1 and described increase variable and.
42. data unit sender according to claim 40, be arranged to communicate by letter with a plurality of different data cell receivers, and comprise that the initial value that is used to implement to be used to make described relative mistake adapts to the element of the initial value procedure of adaptation that is used for new communication, according to its described data unit sender with the basis of the pseudo-initial data unit that retransmits during described a plurality of data cell receivers are communicated by letter on make described initial value adaptation.
43., comprise in the time cycle that is used for monitoring preset the monitor of the quantity of the pseudo-initial data unit that retransmits and the ratio of the quantity of interior all efficient communications of described preset time cycle in all efficient communications according to the data unit sender of claim 42.
44. according to the data unit sender of claim 43, the described element that wherein is used to implement the described initial value procedure of adaptation comprises:
If-be used for described ratio and low threshold ratio and described ratio be positioned at described low threshold value with the next littler element of described initial value that makes, and
If-be used for described ratio with surpass described high threshold than the bigger high threshold comparison of described low threshold value and described ratio then make the bigger element of described initial value.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2003/007008 WO2005006665A1 (en) | 2003-07-01 | 2003-07-01 | Method for setting the retransmission timeout period in a packet switched communication network |
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| Publication Number | Publication Date |
|---|---|
| CN1788464A CN1788464A (en) | 2006-06-14 |
| CN100469045C true CN100469045C (en) | 2009-03-11 |
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ID=34042655
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| CN03826709.8A Expired - Fee Related CN100469045C (en) | 2003-07-01 | 2003-07-01 | Method for setting the retransmission timeout period in a packet switched communication network |
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| US (1) | US7613976B2 (en) |
| EP (1) | EP1639760B1 (en) |
| CN (1) | CN100469045C (en) |
| AT (1) | ATE504136T1 (en) |
| AU (1) | AU2003304623A1 (en) |
| DE (1) | DE60336595D1 (en) |
| WO (1) | WO2005006665A1 (en) |
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| JP4511547B2 (en) * | 2004-09-17 | 2010-07-28 | 三洋電機株式会社 | Communication terminal |
| US7965639B2 (en) * | 2005-03-14 | 2011-06-21 | Sharp Laboratories Of America, Inc. | Dynamic adaptation of MAC-layer retransmission value |
| US8615003B1 (en) * | 2005-10-28 | 2013-12-24 | At&T Intellectual Property Ii, L.P. | Method and apparatus for handling network element timeouts in a packet-switched communication network |
| US8634325B2 (en) * | 2007-12-31 | 2014-01-21 | Schneide Electric USA, Inc. | Tuning of industrial automation system performance based on device operating characteristics |
| US8422370B2 (en) * | 2008-06-27 | 2013-04-16 | International Business Machines Corporation | Reducing retransmission of out of order packets |
| TWI399052B (en) * | 2008-09-18 | 2013-06-11 | Pixart Imaging Inc | Packet retransmission method and related electronic device |
| US20110090795A1 (en) * | 2009-09-11 | 2011-04-21 | Victor On Kwok Li | Differentiation among occurrences of packet reordering, congestive packet loss, or random packet loss in communication networks |
| CN101938414B (en) * | 2010-08-27 | 2013-08-14 | 北京星网锐捷网络技术有限公司 | Method and device for transmitting messages |
| US8639834B2 (en) | 2010-11-09 | 2014-01-28 | International Business Machines Corporation | Self-adjusting application heartbeat management |
| US8483095B2 (en) | 2010-11-11 | 2013-07-09 | International Business Machines Corporation | Configurable network socket retransmission timeout parameters |
| WO2014066359A1 (en) | 2012-10-22 | 2014-05-01 | Texas State University-San Marcos | Optimization of retransmission timeout boundary |
| KR101533870B1 (en) * | 2012-10-25 | 2015-07-06 | 삼성에스디에스 주식회사 | Apparatus and method for retransmitting message in message transmission system |
| US20150012792A1 (en) * | 2013-07-03 | 2015-01-08 | Telefonaktiebolaget L M Ericsson (Publ) | Method and apparatus for providing a transmission control protocol minimum retransmission timer |
| CN105721333B (en) * | 2016-01-21 | 2019-02-15 | 全时云商务服务股份有限公司 | A kind of data transmission device and method |
| CN115396068A (en) * | 2018-07-02 | 2022-11-25 | 华为技术有限公司 | Retransmission control method, communication interface and electronic equipment |
| US10841231B2 (en) * | 2018-11-15 | 2020-11-17 | Mellanox Technologies, Ltd. | Transmission timeout system |
| CN112887063B (en) * | 2021-01-19 | 2023-04-07 | 网易（杭州）网络有限公司 | Data packet transmission method and device, storage medium and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5774479A (en) * | 1995-03-30 | 1998-06-30 | Motorola, Inc. | Method and system for remote procedure call via an unreliable communication channel using multiple retransmission timers |
| US6112064A (en) * | 1997-08-26 | 2000-08-29 | Thomson Consumer Electronics Sales, Gmbh | RDS radio with multi-function RDS button |
| KR100300998B1 (en) * | 1998-04-17 | 2001-09-06 | 윤종용 | Method and device for generating land/groove switching signal |
| US6608813B1 (en) * | 1998-11-04 | 2003-08-19 | Agere Systems Inc | Method and apparatus for achieving fault tolerance in packet switching systems with inverse multiplexing |
| US6401127B1 (en) * | 1999-05-04 | 2002-06-04 | Cisco Technology, Inc. | Adaptive timer for LLC type 2 reliable transport in a computer network |
| EP1077559A1 (en) | 1999-08-17 | 2001-02-21 | Telefonaktiebolaget Lm Ericsson | Method and device for determining a time-parameter |
| US6907460B2 (en) | 2001-01-18 | 2005-06-14 | Koninklijke Philips Electronics N.V. | Method for efficient retransmission timeout estimation in NACK-based protocols |
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- 2003-07-01 CN CN03826709.8A patent/CN100469045C/en not_active Expired - Fee Related
- 2003-07-01 EP EP03740398A patent/EP1639760B1/en not_active Expired - Lifetime
- 2003-07-01 AU AU2003304623A patent/AU2003304623A1/en not_active Abandoned
- 2003-07-01 US US10/595,018 patent/US7613976B2/en active Active
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| EP1639760B1 (en) | 2011-03-30 |
| WO2005006665A1 (en) | 2005-01-20 |
| DE60336595D1 (en) | 2011-05-12 |
| ATE504136T1 (en) | 2011-04-15 |
| EP1639760A1 (en) | 2006-03-29 |
| CN1788464A (en) | 2006-06-14 |
| US7613976B2 (en) | 2009-11-03 |
| AU2003304623A1 (en) | 2005-01-28 |
| US20060234644A1 (en) | 2006-10-19 |
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